TMJ

Question 1

Defintion of the TMJ?

Answer 1

Articulation between the condyle of the mandible and the squamous portion of the temporal bone

Question 2

Key features of the mandible?

Answer 2

Angle of mandible
Ramus of mandible
Neck of mandible
Mental foramen
Mandibular foramen

Question 3

What occurs during mouth opening to the TMJ - rotation? translation?

Answer 3

Rotation:
- around horizontal axis through condylar head
Translation:
- condyle and meniscus move together anteriorly beneath the articular eminence

Question 4

Function of TM ligaments?

Answer 4

Runs from zygomatic arch to condylar neck

Limits downwards and posterior displacement of the joint

Question 5

TMJ movements - protraction/retraction? opening/closing?

Answer 5

Pro/re:
- glide occurs mainly in the upper compartment of TMJ
Open/close:
- gravity moves hinge joint movement taking place in lower compartment
- active compound movement when hinge glides
Hinge and sliding joint

Question 6

Occlusal problems - muscle action and occlusion relation?

Answer 6

Muscle problems associated with the joint as joint position is determined by muscle action until moment of intercuspation when an irresistible force determines the position (occlusion)

Problems occur when the occlusal position and muscular position are not in harmony

Question 7

Joint capsule nerve supply?

Answer 7

Auriculotemporal nerve from mandibular